Create route in titanium map module

readme.txt

Create a file in your lib folder, like **rootproject**/lib/routes.map.js


load the module in your file and initialize with the data:

var jsonCoordinates = {
    'destination': dest.latitude + ',' + dest.longitude,
    'origin': origin.latitude + ',' + origin.longitude,
};
var routes = require("routes.map")(jsonCoordinates, mapview);

routes.map.js

var Init = function(jsonCoordinates, mapviewElement){
    try{
    var param = [
    'destination=' + jsonCoordinates.destination,
    'origin=' + jsonCoordinates.origin,
    'sensor=false',
    'key=' + Alloy.CFG.apiKey_google  //Your api google api key
    ];
    var url = 'https://maps.googleapis.com/maps/api/directions/json?' + param.join('&');

    xhr = Titanium.Network.createHTTPClient();
    xhr.onload = function(e){
        var mapObj = JSON.parse(this.responseText);
        if (mapObj.routes.length > 0){
        	//trasform the point in coordinates
            var points = creayteRouteData(mapObj);
            //I'have declared MAP module in ALLOY.JS
            var route = Alloy.Globals.Map.createRoute({
                name: '1',
                points: points,
                color: '#2ecc71',
                width: 4
            });
            mapviewElement.addRoute(route);
        } else{
            return;
        }
    };
    xhr.open('GET', url);
    xhr.send();
    }catch(e){}
};


var createRouteData = function(json){

    var step = json.routes[0].overview_polyline.points;
    var intStep = 0,
    intSteps = step.length,
    points = [];
    var decodedPolyline,
    intPoint = 0,
    intPoints = 0;

    decodedPolyline = decodeLine(step);
    intPoints = decodedPolyline.length;
    for (intPoint = 0; intPoint < intPoints; intPoint = intPoint + 1){
        if (decodedPolyline[intPoint] != null){
            points.push({
                latitude: decodedPolyline[intPoint][0],
                longitude: decodedPolyline[intPoint][1]
            });
        }
    }

    return points;

};

var decodeLine = function(encoded){
    var len = encoded.length;
    var index = 0;
    var array = [];
    var lat = 0;
    var lng = 0;

    while (index < len){
        var b;
        var shift = 0;
        var result = 0;
        do{
            b = encoded.charCodeAt(index++) - 63;
            result |= (b & 0x1f) << shift;
            shift += 5;
        }
        while (b >= 0x20);

        var dlat = ((result & 1) ? ~ (result >> 1) : (result >> 1));
        lat += dlat;

        shift = 0;
        result = 0;
        do{
            b = encoded.charCodeAt(index++) - 63;
            result |= (b & 0x1f) << shift;
            shift += 5;
        }
        while (b >= 0x20);

        var dlng = ((result & 1) ? ~ (result >> 1) : (result >> 1));
        lng += dlng;

        array.push([lat * 1e-5, lng * 1e-5]);
    }

    return array;
};


module.exports = Init;